Terra Mar wanted to issue passports. There are at least 1 billion "undocumented" people in the world. The ability to create identity documents would be of enormous significance to human trafficking.
Ghislaine's licenses to operate submarines and underwater drones also seems important. We know for a fact traffickers use submarines for narcotics. Some of the new giga-yachts are including "moon pools", where a submarine can enter the hull of the ship undetected from the surface.
RE: Unredacted Black Book - Ghislaine Maxwell's Charity Terra Mar